Proceedings of the Korean Society of Broadcast Engineers Conference (한국방송∙미디어공학회:학술대회논문집)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Boundary Strength based Adaptive Interpolation Filter

경계 강도 기반의 적응적 보간 필터

  • Song, Yunseok (Gwangju Institute of Science and Technology (GIST)) ;
  • Choi, Jung-Ah (Gwangju Institute of Science and Technology (GIST)) ;
  • Ho, Yo-Sung (Gwangju Institute of Science and Technology (GIST))
  • 송윤석 (광주과학기술원 영상통신연구실) ;
  • 최정아 (광주과학기술원 영상통신연구실) ;
  • 호요성 (광주과학기술원 영상통신연구실)
  • Published : 2014.06.30
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Abstract

This paper presents an adaptive interpolation filtering scheme for the High Efficiency Video Coding (HEVC) standard. In regards to interpolation for motion estimation and compensation, the conventional HEVC employs 8-tap and 4-tap filters for luma and chroma samples, respectively. Coefficients in such filters are determined by discrete cosine transform (DCT). In the proposed scheme, boundary strength values are stored after the execution of the deblocking filter. For each block, the sum of boundary strength values is calculated to indicate whether its region is complex or simple. Consequently, based on the region classification, 12-tap and 8-tap interpolation filters are used for complex and simple regions, respectively. This process is applied to luma sample interpolation only. Simulation results show 1.8% average BD-rate reduction compared to the conventional method.

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